There is a lot of talk about Elubatel (which to my mind can be generalized to a lot of other success oriented magic) often completely upending a person's life, more or less backing them into a wall so that the person has to marshal their resources to become successful. These are two thoughts I have.
1 - Perhaps Elubatel's actual method is not to grant success, but to create the conditions under which you become successful. Which many people will experience as extreme upset in their exterior world. For example, the scenario where you do a working for success then end up fired from your job, losing your car, having to move, etc. It turns out that where you end up moving to is a better environment down the road. (I did a major working to be able to return to school in my 30s and these things happened. It was devastating and resulted in a type of PTSD related to my previous profession. I became a very different person and ended up in a completely different field.)
I've experienced similar things regarding other magic I've done, along the same lines, so it may just be how a lot of that type of magic works in real life. Especially when you're asking for something that involves a major life change or personality change, as opposed to something in the immediate that might be better served via a simple candle spell or sympathetic magic type of operation.
2 - Perhaps the degree of upheaval is relative to the number of obstacles. The things you're going to lose are things that were holding you back. If you're a person who's really rigid and stuck in their ways, and getting by, you may lose the foundation that enabled any of those things and find yourself in a position where you're forced to adapt or starve. As for Elubatel causing depression, perhaps one of the effects of working with that spirit is that you may be facing your own self-sabotage or low self worth that created your lack of success. Or become even more aware of it once you've cast for it. Has anyone found this the case?
Also, one last thing... I feel that a lot of people will have experienced these types of effects and made these types of observations if they've practiced any form of magic for a long time. Who is experiencing the severe fallout and or depression? Experienced practicioners, or beginners? There would be different implications in the case of each, I feel.